Electrotherapeutic apparatus



UNITED STATES f PATENT opinion;

wannam. cannson AND mm. '0. nausea; or WASHINGTON, ms'rmc'r or r commrm.

nmcraornaaarsu'rxc APPARATUS.

7 '0 all whom it may concern.-

Be it known that we, WENDELL L. CARL- SON and EARL C. HANSON, citizensof the United States, residing at Washington, District of Columbia, haveinvente certain 'new and useful Improvements in Electrohigh frequencycurrents for imparting bene-' ficial effects to the body.

Heretofore difliculty has been experienced in obtaining steady sustainedcurrents of a frequency that would not affect the nervous stood byreferring to the accompanying system of the patient under treatment.Present high frequency apparatus is not satisfactory for the reason thatthe patient is subject to severe shocksfrom currents of a varyingfrequency. a

Our invention will bemore fully underdrawings in which the three figuresare diagrammatical illustrations of different forms of applicantsinvention. In Figure 1 nu meral 1 represents an oscillating vacuum tubehaving a filament 2 heated by a battery 3, a grid 4 connected throu hthe inductance 6 to the filament 2. The p ate 5 is connected through'the inductance 7 and through a direct current high voltage generator 8to the filament 2. The generator 8 is shunted by a high capacityfixcdcondenser 9. Inductively coupled to the inductances 6 and 7 is aninductance 10 which is connected in a series circuit consisting of thevariable capacity 11, electrodes 12 and 14 and thermoamrneter 13. InFig. 2 inductance 10 has one terminal grounded at 1.5 throughthermo-ammeter 13, the other terminal of which is connected to a vacuumelectrode 16. Fig. 3 shows diagrammatically the inductance 10 connectedthrough the variablecapacity 11 to the inductance coil 17 and athermo-ammeter 13. In Fig. 1 the electrodes 12 and 14 are suitablyconstructed so as to be applied directly to the body of the patient. Theoscillating currents set up in the circuit above described passingthrough the body between the electrodes 12 and 14 produce a highlybeneficial effect. All of the inductances employed are. variable asindicated by the arrows. I x

I The operation of the system is as follows:

Specification ot Lettorslatent.

' Patented May 4.1920.

Application an July 12, 1919. Serial in. 310,852

The oscillatin vacuum tube circuitshown" in F i l is a justed so as togenerate sustaine high frequency-oscillations. The inductance 10 isinductively coupled tothe inductances 6 and 7, the result of which isthe transfer of high frequency energy to the circuit comprising theinductance l0, variable condenser 11, electrodes 12'and 14 andthermo-ammeter 13. In ele'ctrotherapeutics this current is known asthe-DArsonval current.

In Fig, 2 theinductance 10 is shown connected in circuit with a vacuumelectrode 16,

thermo-ammeter 13 and. ground 15. The

vacuum electrode 16 is applied to the surface of the body and producesthe wellknown Tesla current effect. 1

In Fig. 3 the inductance coil.17 is substituted for the electrodes 12and 14 shown in Fig. 1 and brought near the patients body. Highfrequency current is induced in the patients body due to the eddycurrent effect produced by the magnetic field created around theinductance 17 by the sustained high frequencycurrents surging therein.The circuits are adjusted to resonance at a frequency substantially.above that frequency which would be detected by the nervous system ofthe body.

In the practical operation of this system the advantages over themethods used in the prior art lie in the fact thatsteadysustained highfrequency oscillations are produced by the oscillating vacuum tubecircuit in lieu of the unsteady currents produced by the apparatus asnow employed in e lec-v I trotherapeu'tics.

We claim:

1. In electrotherapeutics, the combination of an oscillating vacuum tubecircuit. for the generation of sustained high frequency cur-- rentssubstantially above that frequency which effects the nervous system ofthe body, with means for tuning the oscillating circuit, and meansfor'applying said sustained high frequency currents to the body of apatient to produce beneficial effects therein,

substantially as and for the purpose described. 1

2. In electrotherapeutics, the combination with a, plurality of-handelectrodes 'connected in circuit with a variable capacity andinductance, and an indicating meter, of a vacuum'tu'be oscillatingcircuit associated with said inductance and adapted to produce steadysustained high frequency oscillations, substantially as and. for thepurpose described.

3; In electrotherapeutics, a vacuum tube oscillator adapted to producesustained 0scillations, and means for tuning said oscillations, saidvacuum tube oscillator including a circuit containing inductances, incom bination with a circuit containing, means for applying said current.to the body, substantlally as and for the purpose described WENDELL L.'CARLS'ON. EARL c. HANSON. I

